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Diffstat (limited to 'src/smt_util/ite_removal.h')
-rw-r--r-- | src/smt_util/ite_removal.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/src/smt_util/ite_removal.h b/src/smt_util/ite_removal.h new file mode 100644 index 000000000..0cc0ea5d0 --- /dev/null +++ b/src/smt_util/ite_removal.h @@ -0,0 +1,93 @@ +/********************* */ +/*! \file ite_removal.h + ** \verbatim + ** Original author: Dejan Jovanovic + ** Major contributors: Kshitij Bansal, Tim King, Morgan Deters + ** Minor contributors (to current version): Clark Barrett + ** This file is part of the CVC4 project. + ** Copyright (c) 2009-2014 New York University and The University of Iowa + ** See the file COPYING in the top-level source directory for licensing + ** information.\endverbatim + ** + ** \brief Removal of term ITEs + ** + ** Removal of term ITEs. + **/ + +#include "cvc4_private.h" + +#pragma once + +#include <vector> + +#include "context/cdinsert_hashmap.h" +#include "context/context.h" +#include "expr/node.h" +#include "smt_util/dump.h" +#include "util/bool.h" +#include "util/hash.h" + +namespace CVC4 { + +namespace theory { + class ContainsTermITEVisitor; +}/* CVC4::theory namespace */ + +typedef std::hash_map<Node, unsigned, NodeHashFunction> IteSkolemMap; + +class RemoveITE { + typedef context::CDInsertHashMap< std::pair<Node, bool>, Node, PairHashFunction<Node, bool, NodeHashFunction, BoolHashFunction> > ITECache; + ITECache d_iteCache; + + +public: + + RemoveITE(context::UserContext* u); + ~RemoveITE(); + + /** + * Removes the ITE nodes by introducing skolem variables. All + * additional assertions are pushed into assertions. iteSkolemMap + * contains a map from introduced skolem variables to the index in + * assertions containing the new Boolean ite created in conjunction + * with that skolem variable. + * + * With reportDeps true, report reasoning dependences to the proof + * manager (for unsat cores). + */ + void run(std::vector<Node>& assertions, IteSkolemMap& iteSkolemMap, bool reportDeps = false); + + /** + * Removes the ITE from the node by introducing skolem + * variables. All additional assertions are pushed into + * assertions. iteSkolemMap contains a map from introduced skolem + * variables to the index in assertions containing the new Boolean + * ite created in conjunction with that skolem variable. + */ + Node run(TNode node, std::vector<Node>& additionalAssertions, + IteSkolemMap& iteSkolemMap, bool inQuant); + + /** + * Substitute under node using pre-existing cache. Do not remove + * any ITEs not seen during previous runs. + */ + Node replace(TNode node, bool inQuant = false) const; + + /** Returns true if e contains a term ite. */ + bool containsTermITE(TNode e) const; + + /** Returns the collected size of the caches. */ + size_t collectedCacheSizes() const; + + /** Garbage collects non-context dependent data-structures. */ + void garbageCollect(); + + /** Return the RemoveITE's containsVisitor. */ + theory::ContainsTermITEVisitor* getContainsVisitor(); + +private: + theory::ContainsTermITEVisitor* d_containsVisitor; + +};/* class RemoveTTE */ + +}/* CVC4 namespace */ |